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<b>let </b><font color="Maroon" title="c1">R</font>, <font color="Maroon" title="c2">S</font>, <font color="Maroon" title="c3">T</font> be  non <a href="struct_0.html#V2" title="STRUCT_0:attr.2">empty</a>  <a href="orders_2.html#L1" title="ORDERS_2:struct.1">RelStr</a> ;<br/><b>let </b><font color="Maroon" title="c4">f</font> be   <a href="struct_0.html#NM6" title="STRUCT_0:NM.6">Function</a> of <span class="p1"><a href="yellow_3.html#K3" title="YELLOW_3:func.3">[:</a><span class="default"><font color="Maroon" title="c1">R</font>,<font color="Maroon" title="c2">S</font></span><a href="yellow_3.html#K3" title="YELLOW_3:func.3">:]</a></span>,<font color="Maroon" title="c3">T</font>;<br/><b>let </b><font color="Maroon" title="c5">a</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c1">R</font>;<br/><b>let </b><font color="Maroon" title="c6">b</font> be   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Maroon" title="c2">S</font>;<br/>







<span class="p1">(<span class="default"><a href="waybel24.html#K1" title="WAYBEL24:func.1">Proj</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">a</font></span>)</span> <a href="funct_2.html#K3" title="FUNCT_2:func.3">.</a> <font color="Maroon" title="c6">b</font> = 
<font color="Maroon" title="c4">f</font> <a href="binop_1.html#K1" title="BINOP_1:func.1">.</a> <font color="Maroon" title="c5">a</font>,<font color="Maroon" title="c6">b</font>
<b>by </b><i><a class="ref" href="waybel24.html#T7" target="_self" title="WAYBEL24:th.7">Th7</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="waybel24.html#K2" title="WAYBEL24:func.2">Proj</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c6">b</font></span>)</span> <a href="funct_2.html#K3" title="FUNCT_2:func.3">.</a> <font color="Maroon" title="c5">a</font>
<b>by </b><i><a class="ref" href="waybel24.html#T8" target="_self" title="WAYBEL24:th.8">Th8</a></i>
;<br/>
<b>hence </b><a NAME="E2:15"/>
<span class="p1">(<span class="default"><a href="waybel24.html#K1" title="WAYBEL24:func.1">Proj</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c5">a</font></span>)</span> <a href="funct_2.html#K3" title="FUNCT_2:func.3">.</a> <font color="Maroon" title="c6">b</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="waybel24.html#K2" title="WAYBEL24:func.2">Proj</a> <font color="Maroon" title="c4">f</font>,<font color="Maroon" title="c6">b</font></span>)</span> <a href="funct_2.html#K3" title="FUNCT_2:func.3">.</a> <font color="Maroon" title="c5">a</font>
 ;<br/>


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